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课时提升作业(十二) 必修4 Unit 3 Ⅰ. 单项填空 1. (2017·尤溪模拟)If we do not maintain our vigilance(警惕), people’s confidence food safety can be destroyed instantly—even in a developed country. A. withB. inC. toD. of 2. (2017·六安模拟)Over fifty passengers were injured in the accident, and every doctor was called to the scene. A. convenient B. available C. vacant D. conscious 3. The soldier was of running away when the enemy attacked. A. scolded B. charged C. accused D. punished 4. (2017·安庆模拟)The city is changing so rapidly that the maps of the city go out of date almost they are published. A. until B. since C. unless D. immediately 5. (2017·聊城模拟)At the meeting, all the people were deeply with her brilliant report. A. impressed B. surprised C. excited D. comforted 6. With more forests being cut down, the environment of this town has become worse and worse, which has greatly the local economic development. A. held back B. held on C. held down | 
